Superheater boiler



ay 9, 1939. w. H. ARMACOST 2,157,746

SUPERHEATER BOILER Filed Nov. 27, 1937 INVENTOR ATTORNE Patented May 9, 1939 UNITED STATES PATENT OFFICE SUPERHEATER BOILER Application November 27, 1937, Serial No. 176,790

Claims.

The present invention relates to boilers and particularly to boilers provided with superheaters.

A feature of the present invention is an im- 5 proved boiler and superheater construction permitting regulation of the temperature of superheated steam independently of changes in the rate of firing to generate varying quantities of steam as the load on the boiler fluctuates.

A second feature resides in a construction which affords full protection to the superheater when the boiler is being fired up.

Other features and advantages of the invention will become apparent upon consideration of the following description and appended claims when read in conjunction with the accompanying drawing. in which the single figure is a diagrammatic elevational view of an illustrative embodiment of the invention.

In the boiler shown in the drawing the steam and water drum I0 is disposed above and connected to the lower or Water drum II by a generating bank I2 comprising rows of tubes. The exterior walls of the boiler setting are arranged to form separate furnace chambers I3 and It at each side of the drums I0, I I, that is, at opposite sides of the generating bank l2. Other generating tubes l5, it are disposed on the roof and outer side walls of the furnace chambers l3, l4. Bafiles ll, l8 extending upwardly from the water drum II and downwardly from the steam drum Ill) part-way along the outermost rows of tubes in the bank l2 direct gases from the furnace chamber l3 over the tubes of the generating bank to an up-pass leading to the boiler offtake 2 l, the outer wall of up-pass 20 being formed by a baflie 22 extending downwardly from the roof of the furnace chamber It.

Two rows of tubes 23, 2t connected at their ends to the drums H], II have intermediate portions thereof offset towards the furnace chamber l2 and disposed in spaced rows between which are located the heat-absorbing elements of a superheater 25. A baffle 26 extending upwardly part-way along the row of tubes 22 together with the baflle 22 forms a gas pass for directing gases from the furnace chamber It across the superheater to the up-pass 20 and the boiler ofitake 2|. An economizer 21 is located in the up-pass 20 and is heated by gases flowing across the generating bank I2 from chamber I3 and across the superheater 25 from chamber M.

Individual firing means 28 and 30 are provided for the furnace chambers l3 and M, respectively, and with the arrangement of heating surfaces show-n in the drawing the temperature of superheated steam may be regulated by varying the rate of fuel supply to the burners 30 for chamber l4 independently of the amount of fuel that is supplied to the burners 28 for chamber [3 in order to generate the varying quantities of steam that may be required as the load upon the boiler fluctuates. It will also be seen that when firing up the boiler it is necessary to employ only the burners 28 for the furnace chamber I3 and the gases passing over the generating bank l2 do not affect the superheater 25 which consequently is fully protected at this time.

Although an illustrative embodiment of the invention has been shown and described in detail, it is to be understood that various changes and rearrangements may be made without departing from the invention so long as separate firing means are provided within the boiler setting for the generating elements and for the superheater.

What I claim is:

1. In a water tube boiler having upper and lower drums interconnected by a substantially vertical bank of generating tubes; means defining separate furnace chambers at opposite sides of said bank; a gas offtake; means directing gases from one of said chambers over said bank of generating tubes to said ofitake; generating tubes connected at their opposite ends to said drums and having portions intermediate their ends offset laterally from said bank toward said other furnace chamber and disposed in spaced rows; a superheater having its heat absorbing elements disposed in the space between said rows of tube portions; means for directing gases from said other furnace chamber through said space and over said superheater elements to said ofttake; and fuel feeding means individual to said chambers.

2. In a water tube boiler having a pair of superposed drums interconnected by a substantially vertical bank of generating tubes; means defining separate furnace chambers at opposite sides of said bank; a gas ofitake so arranged that gases flowing thereto pass over said bank from one of said chambers; spaced rows of tubes bent near their ends to connect with said drums and having intermediate portions offset laterally from said bank toward the other of said chambers and arranged in rows spaced sufliciently to provide room for a superheater; a superheater having its heat absorbing elements disposed in the space between the rows formed by said offset tube portions; means directing gases from said other chamber over said superheater elements to said oiltake; and fuel feeding means individual. to said chambers.

3. In a water tube boiler having parallel upper and lower drums interconnected by generating tubes, and a furnace chamber located at one side ofsaid drums; means defining another furnace chamber at the other side of said drums; an ofitake for said other chamber; a superheater having its heat absorbing elements disposed in. the path of gases from said other chamber; a row of tubes connected to said drums and having C-shaped portions offset toward said other chamber to embrace said superheater elements, parts of said tube portions being arranged to permit the flow of gases from said other chamber across said superheater to said ofitake; and fuel feeding means individual to said chambers.

4. In a water tube boiler having upper and lower drums interconnected by a substantially vertical bank of generating tubes, means defining separate furnace chambers at opposite sides of said bank; fuel feeding means individual to said chambers; other generating tubes connected to said drums and disposed on the walls of said chambers to be heated by gases produced therein; a gas offtake; means directing gases from one of said chambers over said bank of generating tubes to said ofltake; means defining a gas pass from the other of said chambers to said offtake; and a superheater having the heat absorbing elements thereof disposed in said gas pass to be heated by gases flowing from said other chamber to said offtake.

5. In a water tube boiler having upper and lower drums interconnected by a substantially vertical bank of generating tubes; means defining separate furnace chambers at opposite sides of said bank; fuel feeding means individual to said chambers; other generating tubes connected to said drums and disposed on the walls of said chambers to be heated by gases produced therein; a gas offtake; means directing gases from one of said chambers over said bank of generating tubes to said oiftake; means defining a gas pass from the other of said chambers to said oiftake; and a superheater having the heat absorbing elements thereof disposed in said gas pass to be heated by gases flowing from said other chamber to said ofitake; and other generating tubes connected to said drums and having portions offset from said bank toward said other chamber and disposed in spaced rows between which said superheater elements are located.

WILBUR H. ARMACOST. 

